Importance

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Abstract

VLAN numbering in access networks which bi-directionally connect subscribers and service providers. For an outgoing packet flowing in a direction from a network side to a subscriber side through a network terminator (NT), a port number appearing in a packet header on the network side is not copied by the NT into a header of a corresponding packet applied to the subscriber side, but the NT copies VLAN numbers for the services from the former to the latter packet headers. All services from one specific service provider are delivered to the subscriber through one specific physical port on the subscriber side which corresponds to the port number. For incoming packet flow from the subscriber side into the network side, the NT inserts a port number into a header of a packet applied to the network side, corresponding to the physical port on the NT at which an associated packet was received on the subscriber side, with NT copying the VLAN numbers for the services from the header of the subscriber-side packet into that of the network-side packet.

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First Claim